On a horizontal surface, an object slides from point P to point Q along a straight line, then slides back from Q to P along a semicircle. If P and Q are a distance L apart, how much work did the force of kinetic friction do during the entire process? The magnitude of fk is fk.

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Chapter1: Units, Trigonometry. And Vectors
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On a horizontal surface, an object slides from point P to point Q along a straight line, then slides back from Q to P along a semicircle.

If P and Q are a distance L apart, how much work did the force of kinetic friction do during the entire process? The magnitude of fk is fk.

Q
P
Transcribed Image Text:Q P
1. 2 (T + 1) L fk
2. 2 L fk
3. Zero, since
fr · dr = 0
4. – (T + 1) L fk
5. (2т — 1) L fk
6. — (2т + 1) L fe
7.2п L fk
8. – G +1) L fr
2
Transcribed Image Text:1. 2 (T + 1) L fk 2. 2 L fk 3. Zero, since fr · dr = 0 4. – (T + 1) L fk 5. (2т — 1) L fk 6. — (2т + 1) L fe 7.2п L fk 8. – G +1) L fr 2
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